US4298255A - Apparatus for preflashing motion picture film - Google Patents
Apparatus for preflashing motion picture film Download PDFInfo
- Publication number
- US4298255A US4298255A US06/168,518 US16851880A US4298255A US 4298255 A US4298255 A US 4298255A US 16851880 A US16851880 A US 16851880A US 4298255 A US4298255 A US 4298255A
- Authority
- US
- United States
- Prior art keywords
- light
- cavity
- rod
- motion picture
- light source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B19/00—Cameras
- G03B19/18—Motion-picture cameras
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/12—Cinematrographic processes of taking pictures or printing
Definitions
- This invention relates to photography and is particularly directed to improvements in apparatus for preflashing motion picture film by exposing its emulsion side uniformly with light of very low intensity. It is a feature of this invention that the preflashing occurs as the negative film strip is fed from the film magazine into the motion picture camera.
- preflashing of photographic film may improve its light sensitivity so that the camera may be operated at one and one-half to two "T"-stops less than that required without preflashing. It is highly desirable to control the low level of light for preflashing without using a rheostat for the light source, because adjusting the rheostat changes the color temperature of the light, which is undesirable. Moreover, the light for preflashing should be uniformly distributed over the emulsion side of the negative film. Also, there should be provision for color filters to control the desired quality of light.
- the apparatus may be formed as a part of the motion picture camera or a part of the film magazine or may comprise a separate insert installed between the camera and the magazine.
- the apparatus includes a body having an internal cavity in which an electric lamp is positioned to serve as a source of light.
- a translucent cylindrical rod or a hollow shell has a portion exposed to the light source.
- an end face of the translucent rod is exposed to the light source.
- An axially extending window on the cylindrical outer surface of the translucent rod interrupts an opaque coating which covers the remainder of the outer surface of the rod.
- a narrow elongated opening is positioned in a wall of the body, parallel to the window, and a removable filter cartridge is located between the translucent rod and the narrow elongated opening. Light from the source then passes out through its lateral window and through the narrow elongated opening in the wall of the cavity to preflash the motion picture film as it passes through a slot in the body.
- the portion of the translucent rod which is exposed to the light source comprises an axially extending light-receiving opening in the opaque coating on the translucent rod.
- a hollow cylindrical shell has diametrically opposed window slots through which the light passes.
- the amount of light for preflashing may be controlled by turning an exposed head on the translucent rod or hollow shell so that more or less light from the window(s) reaches the narrow elongated opening in the insert body.
- a filter cartridge may be removably positioned between the translucent rod and the narrow elongated opening.
- FIG. 1 is a sectional elevation showing a preferred embodiment of this invention.
- FIG. 2 is a transverse sectional view taken substantially on the lines 2--2 as shown in FIG. 1.
- FIG. 3 is a sectional detail similar to a portion of FIG. 1, shown on an enlarged scale.
- FIG. 4 is a view similar to FIG. 3 showing the translucent rod turned to a different position.
- FIG. 5 is a fragmentary side view.
- FIG. 6 is a sectional plan view taken substantially on the lines 6--6 as shown in FIG. 5.
- FIG. 7 is a sectional view similar to FIG. 4, showing a modification.
- FIG. 8 is a sectional view similar to FIG. 1, showing another modification.
- FIG. 9 is a fragmentary sectional view similar to FIG. 2 but showing a filter cartridge between the light source and the end face of the translucent rod.
- FIG. 10 is a transverse sectional detail taken substantially on the lines 10--10 as shown in FIG. 9.
- FIG. 11 is a sectional detail similar to FIG. 7 but showing the filter cartridge interposed between the light source and the translucent rod.
- FIG. 12 is a sectional detail similar to FIG. 11 but showing a hollow cylindrical shell for light control, instead of a translucent rod.
- the insert body 10 formed of opaque material is operatively interposed between the film magazine 11 and the housing 12 of the motion picture camera generally designated 13.
- Supply rollers 14 in the film magazine 11 deliver a motion picture negative film strip 15 into the camera 13 through a first slot 16.
- the film strip 15 passes from the camera housing 12 through the second slot 17 and over the takeup rollers 18 in the film magazine 11.
- the separator wall 19 in the body 10 isolates the slots 16 and 17.
- the walls of the body 10 define a cavity 21 which contains a light source 22.
- the translucent cylindrical rod 23 has an end face 24 which receives light from the source 22 and transmits it axially along the translucent rod 23.
- the cavity walls support the rod 23 for turning movement.
- the inside surface of the portion of the cavity 21 enclosing the light source 22 is preferably painted white to reflect the maximum amount of light toward the end face 24 of the translucent rod 23.
- the outer surface of the cylindrical portion of the rod 23 is coated with an opaque substance 25 interrupted only by an elongated window 26 extending parallel to the axis of the cylindrical rod 23.
- a removable cover 30 permits replacement of the light source 22 as well as inspection of the translucent rod 23, its opaque surface 25, and its window 26.
- a narrow elongated opening 27 parallel to the window 26 is provided in a wall of the cavity and extends between the cavity 21 and the first slot 16.
- a removable filter cartridge 28 is interposed between the elongated opening 27 and the window 26 of the translucent rod 23.
- light from the source 22 passes into the translucent rod 23 through its end face 24 and is projected laterally through the window 26, through the filters 29 in the cartridge 28 and then through the narrow elongated opening 27 to preflash the emulsion side of the film strip 15.
- the amount of light for preflashing is controlled by turning the cylindrical translucent rod 23 by means of its head 31 which is accessible exteriorly of the body 10. Turning of the rod 23 moves it from the maximum light position as shown in FIG. 1 to a position such as that shown in FIG. 4 in which the window 26 is canted or tilted with respect to the narrow elongated opening 27. This construction insures an even distribution of light through the length of the narrow elongated opening 27.
- the filter cartridge 28 may be withdrawn laterally from the cavity 21 by sliding the cover 32 to one side, as shown in FIG. 5. This permits the individual filters 29 to be installed or removed as desired.
- the filters control the color of light which passes through the elongated opening 27 to preflash the film strip 15. For example, three filters could be individually colored cyan, magenta, and yellow.
- the light source 22a is mounted in the same cavity 21a with the translucent rod 23a.
- the light source may comprise one or more small lamps.
- the window 26a is similar to that previously described, but in addition there is another window or axially extending light-receiving opening 24a in the opaque coating 25a and located directly opposite the window 26a.
- Light from the source 22a passes through the two windows 24a and 26a, through the filter carrier 28a and narrow opening 27a to preflash the film 15.
- Turning of the translucent rod 23a serves to vary the amount of light passing through the filters 29a and through the narrow opening 27a.
- the head of the translucent rod 23a projects exteriorly of the body 10a as described above.
- a condenser lens 34 is positioned between the light source 22a and the translucent rod 23a in order to spread the light evenly into the second window 24a.
- the filter cartridge 28a is placed between the light source 22 and the end face 24 of the translucent rod 23.
- the filter cartridge 28a is placed between the light source 22 and the window 24a of the translucent rod 23a.
- the filter cartridge 28a is placed between the light source 22 and the hollow cylindrical shell 23b.
- the hollow shell 23b has diametrically opposed window openings 24b and 26b.
- preflash apparatus is shown as being embodied in a separate unit 10 clamped between the film magazine 11 and the housing 12 of the motion picture camera 13, the preflash unit may be embodied within the film magazine 11 or within the housing 12 of the camera 13.
- the light source in each embodiment is operated at full power. It is not necessary to change the light intensity by means of a rheostat or the like, because such control changes the color temperature of the light, which is undesirable.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Light Sources And Details Of Projection-Printing Devices (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Stroboscope Apparatuses (AREA)
Abstract
Description
Claims (14)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/168,518 US4298255A (en) | 1980-07-14 | 1980-07-14 | Apparatus for preflashing motion picture film |
CA000375499A CA1147190A (en) | 1980-07-14 | 1981-04-15 | Apparatus for preflashing motion picture film |
FR8107984A FR2486669A1 (en) | 1980-07-14 | 1981-04-22 | APPARATUS FOR REALIZING THE PRELUMINATION OF A CINEMATOGRAPHIC FILM |
GB8113056A GB2079482B (en) | 1980-07-14 | 1981-04-28 | Film-preflashing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/168,518 US4298255A (en) | 1980-07-14 | 1980-07-14 | Apparatus for preflashing motion picture film |
Publications (1)
Publication Number | Publication Date |
---|---|
US4298255A true US4298255A (en) | 1981-11-03 |
Family
ID=22611821
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/168,518 Expired - Lifetime US4298255A (en) | 1980-07-14 | 1980-07-14 | Apparatus for preflashing motion picture film |
Country Status (4)
Country | Link |
---|---|
US (1) | US4298255A (en) |
CA (1) | CA1147190A (en) |
FR (1) | FR2486669A1 (en) |
GB (1) | GB2079482B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4634244A (en) * | 1985-12-16 | 1987-01-06 | Daniel Jobin | Flashing device for motion picture camera |
EP0444012A2 (en) * | 1990-02-20 | 1991-08-28 | Fritz Bauer | Filmcamera body |
AT407092B (en) * | 1998-02-18 | 2000-12-27 | Bauer Fritz | CAMERA SYSTEM |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4021831A (en) * | 1974-02-05 | 1977-05-13 | Elinca S.A. | Process and device for the photographic reproduction of diapositives |
US4172640A (en) * | 1977-12-30 | 1979-10-30 | Polaroid Corporation | Movie camera having supplemental exposure |
-
1980
- 1980-07-14 US US06/168,518 patent/US4298255A/en not_active Expired - Lifetime
-
1981
- 1981-04-15 CA CA000375499A patent/CA1147190A/en not_active Expired
- 1981-04-22 FR FR8107984A patent/FR2486669A1/en active Granted
- 1981-04-28 GB GB8113056A patent/GB2079482B/en not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4021831A (en) * | 1974-02-05 | 1977-05-13 | Elinca S.A. | Process and device for the photographic reproduction of diapositives |
US4172640A (en) * | 1977-12-30 | 1979-10-30 | Polaroid Corporation | Movie camera having supplemental exposure |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4634244A (en) * | 1985-12-16 | 1987-01-06 | Daniel Jobin | Flashing device for motion picture camera |
EP0444012A2 (en) * | 1990-02-20 | 1991-08-28 | Fritz Bauer | Filmcamera body |
EP0444012A3 (en) * | 1990-02-20 | 1992-07-08 | Fritz Bauer | Filmcamera body |
AT407092B (en) * | 1998-02-18 | 2000-12-27 | Bauer Fritz | CAMERA SYSTEM |
Also Published As
Publication number | Publication date |
---|---|
GB2079482B (en) | 1984-07-11 |
CA1147190A (en) | 1983-05-31 |
FR2486669A1 (en) | 1982-01-15 |
FR2486669B1 (en) | 1984-06-29 |
GB2079482A (en) | 1982-01-20 |
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Legal Events
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STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
AS | Assignment |
Owner name: PV ACQUISITION CORP., LOS ANGELES, CA. A DE CORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PANAVISION, INC. A CA CORP.;REEL/FRAME:004372/0600 Effective date: 19850221 |
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Owner name: PANAVISION, INCORPORATED Free format text: CHANGE OF NAME;ASSIGNOR:PV ACQUISITION CORP.;REEL/FRAME:004382/0185 Effective date: 19850306 |
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Owner name: FIRST NATIONAL BANK OF BOSTON, THE, 100 FEDERAL ST Free format text: SECURITY INTEREST;ASSIGNOR:PV ACQUISITION CORP.;REEL/FRAME:004382/0323 Effective date: 19850301 |
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Owner name: CITICORP INDUSTRIAL CREDIT, INC., 725 SOUTH FIGUER Free format text: SECURITY INTEREST;ASSIGNOR:PANAVISION, INCORPORATED;REEL/FRAME:004801/0160 Effective date: 19871013 |
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Owner name: PANAVISION, INC. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:FIRST NATIONAL BANK OF BOSTON, THE;REEL/FRAME:004812/0400 Effective date: 19871009 |
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Owner name: CITICORP NORTH AMERICA, INC., (FORMERLY CITICORP I Free format text: SECURITY INTEREST;ASSIGNOR:PANAVISION, INCORPORATED;REEL/FRAME:004869/0502 Effective date: 19880217 Owner name: CITICORP NORTH AMERICA, INC. (FORMERLY CITICORP IN Free format text: SECURITY INTEREST;ASSIGNOR:PANAVISION, INCORPORATED;REEL/FRAME:004869/0502 Effective date: 19880217 |
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Owner name: PANAVISION INTERNATIONAL, L.P., NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PANAVISION, INCORPORATED;REEL/FRAME:005863/0832 Effective date: 19910930 |
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Owner name: PANAVISION INTERNATIONAL, L.P., NEW YORK Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:CITICORP NORTH AMERICA, INC.;REEL/FRAME:008792/0908 Effective date: 19960508 |
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Owner name: CHASE MANHATTAN BANK, AS ADMINISTRATIVE AGENT, THE Free format text: SECURITY AGREEMENT;ASSIGNORS:PANAVISION INC.;KEEPCO I, INC.;KEEPCO II, INC.;AND OTHERS;REEL/FRAME:009875/0072 Effective date: 19980604 |